Call Apache Solr usings the apachesolr Drupal module and parse the response.

solr-test-query.php

<?php

// -------------------------------------------------------------------------
//
// Taken from:
// http://worldofdrupal.blogspot.com.ar/2014/01/drupal-7-apache-solr-custom-query.html
//
// -------------------------------------------------------------------------

// Search parameters
$keyword = 'como';
$offset  = 0;
$limit   = 100;

// Get instance
$solr = apachesolr_get_solr();

// Create basic query
$query = apachesolr_drupal_query("custom", array('q' => $keyword));

// Add offset and limits
$query->addParam('start', $offset);
$query->addParam('rows', $limit);

// Turn on highlighting (http://wiki.apache.org/solr/HighlightingParameters)
$query->addParam('hl', TRUE);

// Filter by content-type in this case either nota, nota_galeria or nota_video.
$query->addParam('fq', "bundle:(nota OR nota_galeria OR nota_video)");

// Perform query.
$resp = $query->search();

// Parse response
if ($resp->code == 200) {
  $result = $resp->response;
  $total_rows = $result->numFound;
  $docs = $result->docs;
  print("Found $total_rows nodes.\n\n");
  foreach($docs as $doc) {
    $nid = $doc->entity_id;
    $type = $doc->entity_type;
    $node = node_load($nid);
    $title = $node->title;
    print("$nid $title - $type\n");
  }
}

// snippets
print_r( $resp->highlighting );

// all response
print_r( $resp );

exit(0);